linux-kernel - Re: [RFC][PATCH 10/26] mm, mpol: Make mempolicy home-node aware

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Message-ID: <1332176969.18960.351.camel@twins>
Date:	Mon, 19 Mar 2012 18:09:29 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 10/26] mm, mpol: Make mempolicy home-node aware

On Mon, 2012-03-19 at 10:31 -0500, Christoph Lameter wrote:

> MPOL_DEFAULT is a certain type of behavior right now that applications
> rely on. If you change that then these applications will no longer work as
> expected.
> 
> MPOL_DEFAULT is currently set to be the default policy on bootup. You can
> change that of course and allow setting MPOL_DEFAULT manually for
> applications that rely on old behavor. Instead set the default behavior on
> bootup for MPOL_HOME_NODE.
> 
> So the default system behavior would be MPOL_HOME_NODE but it could be
> overriding by numactl to allow old apps to run as they are used to run.

Ah, OK. Although that's a mightily confusing usage of the word DEFAULT.
How about instead we make MPOL_LOCAL a real policy and allow explicitly
setting that?
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